Improvement in wrenches



@that @ft CHRISTIAN KNISELY, OFKI GII'ICAGO,`ILLINIOISJ Letters Patent No. 109,913, dated December 6;"1870.

IMPROVEMENT IN wRENcHEs.

The Schedule referred to in these Letters vPatent and niaking part of the same.

To all whom it may concern:`

Be it known that I, CHRISTIAN KNIsnLY, ot" Chicago, in the county ofGook and State ot`lllinois, have invented a new and 4useful improved lrVreneh; and I do lhereby declare the following to be a f'nll, clear, and exact description thereof, which will enable 'others skilled in thel art to which my invention appertains to malteand use the same,.refere11cebeing had to the accompan \l ing drawing forming partof thisspeciicution, in which the iignre'is aside elevationof a wrench-with the movable -jaw broken away to show the application of my improvements.

My invention has for its .object to improve the construction and operation of wrenches; and to this end,

It consists in the combination, with the handle or shank and a removable jaw, ot' a cam-lever and two or more movable grping-plates, whereby the jaw is held firmly at any desired` point uponthe handle, as will be hereinafter more fully described.

In the accompanying drawing- A is the handle, and

B, the lixed jaw ot' a wrench for removing or applying nuts to bolts.

Gis the movable jaw, adapted to slide upon the handle A in the usual manner.

rIhis jaw is provided with a recess, D, extending from its under side to the opening through which the handle A passes, as shown in the drawing,

E is a cam-lever, pivoted wit-hin the recess D, and extending along thev handle, to be clasped by the operator. A

Between the cam end ofthe lever and the shank A one or more movable metal plat-es are inserted.

In this example two plates, on n, are employed, the former being provided with sharp, tile-like corrugations placed in contact with the shank A. v

The plate n is slightly rounded upon its side next the cam, to permit the easy movement of the latter.

When it is desired to setthe wrench to a nut the lever is moved voutward from the shank, to relieve the pressure of the cam upon the plates m n, and the jaw moved upon the graduated shank to the requisite position. Ihe lever is then forced by the hand ot the operator toward the shank, and ythe cam, acting against the griping-plates, forces the corrugations of thel plate 7n sharply against the shank, and securely locks the jaw in position. Y

rlhe movement of the latter toward the shank is arrested by the pin o in the former, and a screw, s, in the latter, prevents the movable jaw from sliding oit' when released by the cam.

The plates m n are made removable, and may bel removed from time to time when for any canse this become-s necessary.

The movable jaw and the handle are so constructed that the former may, by removing the screw s, be slid ofi' of the handle for the purposey of adjusting the plates m n, or for any other purpose required.

L1t sometimes occurs thatthe cam does not force the plates in contact with the shank with suiicient power to hold the jaw irnlly in pbsition. This, however, is easily overcome by placing a thin strip of paper or other thin substance between the two plates, as shown at w lin the drawing.

If desired, the plate m may be made without the corrugations, as they are not absolutely essential to the successful operation of the wrench.

Having thus described my invention,

4What I cla-im as new, and desire to secure by Let- I ters Patent, is-

lhe plate n, when arranged between the plate m and the eccentric head ot' the lever E, substantially as described.

CHRISTIAN KNISELY.

Witnesses G. v H. Fnos'r, JOHN JONES. 

